H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 9/00 (2006.01) H04W 12/02 (2009.01) H04L 9/08 (2006.01) H04L 12/22 (2006.01)
Patent
CA 2383960
Method and apparatus for encrypting transmission traffic at separate protocol layers L1 (220), L2 (210), and L3 (200) so that separate encryption elements (204) can be assigned to separate types of transmission traffic (201, 203, 205), which allows the implementation of different levels of encryption according to service requirements. Encryption elements (204) use variable value inputs, called crypto-syncs, along with semi-permanent encryption keys to protect from replay attacks from rogue mobile stations. Since crypto-sync values vary, a method for synchronization and authentificated registration of crypto-syncs is also presented. Crypto-scancs can be built expediently for each different type of traffic frame by using different system resources. In one embodiment, a cyclic redundancy check (CRC) can be used to verify crypto- syncs.
L'invention concerne un procédé et un dispositif de cryptage d'un trafic de transmission au niveau de couches de protocole séparées L1 (220), L2 (210) et L3 (200), des éléments de cryptage séparés (204) pouvant être affectés à des types séparés de trafic de transmission (201, 203, 205), d'où la mise en oeuvre de différents niveaux de cryptage selon des exigences de service. Ces éléments de cryptage (204) utilisent des entrées à valeur variable, appelées <i>crypto-syncs</i>, conjointement avec des clés de cryptage semi-permanentes fournissant une protection contre les attaques répétées de stations mobiles indésirables. Etant donné que les valeurs de ces <i>crypto-syncs</i> varient, l'invention se rapporte également à un procédé de synchronisation de <i>crypto-syncs</i> au niveau de la station mobile et de la station de base.
Quick Roy F. Jr.
Rezaiifar Ramin
Tiedemann Edward G. Jr.
Wang Jun
Williamson Paul
Qualcomm Incorporated
Smart & Biggar
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